Electrostatic Potential Tuning by Low‐Volatility Halogenated Additive: Boosting PTQ10‐Based Binary OPV to Near 20% Efficiency with High Scalability
Abstract
ABSTRACT The commercialization of organic photovoltaics (OPVs) is hampered by the trade‐off between high power conversion efficiency (PCE) and processability, particularly in thick‐film and large‐area fabrication. Herein, three halogenated diphenyl ether additives with similar structures but distinct physical properties, 1‐bromo‐2‐phenoxybenzene ( o ‐BPB), 1‐bromo‐4‐phenoxybenzene ( p ‐BPB), and 4,4′‐oxybis (bromobenzene) (BDPE), are selected to regulate the film‐forming process of the PTQ10: m‐ TEH system. Studies reveal that BDPE exhibits the lowest electrostatic potential (ESP), maximum electron delocalization, and highest decomposition temperature, enabling its retention in the drying film. Through dibromo‐induced negative ESP and π–π complementarity with m ‐TEH, BDPE forms directional noncovalent interactions that delay acceptor nucleation, suppress oversize phase separation, and promote ordered molecular stacking. This ESP‐driven interaction simultaneously optimizes the vertical phase distribution, enhances crystallinity, reduces energy loss, extends exciton diffusion lifetime, and accelerates charge transport while suppressing recombination. Benefiting from these synergistic effects, the BDPE‐based PTQ10: m ‐TEH device achieves a PCE of 19.80%, delivers a short‐circuit current density of 30.49 mA cm −2 at 500 nm thickness. BDPE also shows universality in various binary systems (20.11% PCE for D18:L8‐BO) and good processability in large‐area modules. This work provides an efficient strategy for low‐cost thick‐film OPVs, offering new theoretical and engineering pathways for their up‐scale production.
Article Details
Authors (19)
Hongyang Lu
Key Laboratory of Organosilicon Chemistry and Material Technology Zhejiang Key Laboratory of Organosilicon Material Technology College of Materials Ministry of Education Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou P. R. China
Jiaxu Che
College of New Materials and New Energies Shenzhen Technology University Shenzhen P. R. China
Lingling Zhan
Lu Wei
Tianchen Lu
Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, State Key Laboratory of Bioinspired interfacial Materials Science
Tianyi Chen
Guangye Zhang
Xian‐Kai Chen
Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University Suzhou 215123 P.R. China
Xiangyue Kong
Zhejiang Key Laboratory of Optoelectronic Functional Materials and Devices Zhejiang University‐Hangzhou Global Scientific and Technological Innovation Center Hangzhou P. R. China
He Liu
Department of Gastrointestinal Surgery, The First Affiliated Hospital
Yuhao Liu
Jie Min
School of Physics and Technology University of Jinan Jinan Shandong P. R. China
Zhenzhen Mo
Key Laboratory of Organosilicon Chemistry and Material Technology Zhejiang Key Laboratory of Organosilicon Material Technology College of Materials Ministry of Education Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou P. R. China
Ting Wang
Department of Radiation Oncology The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital Zhengzhou China
Xuechen Jiao
National Synchrotron Radiation Laboratory
Weiming Qiu
Guangzhou Chasinglight Technology Co., Ltd Guangzhou P. R. China
Shouchun Yin
Key Laboratory of Organosilicon Chemistry and Material Technology Zhejiang Key Laboratory of Organosilicon Material Technology College of Materials Ministry of Education Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou P. R. China
Zhi‐xi Liu
Zhejiang Key Laboratory of Optoelectronic Functional Materials and Devices Zhejiang University‐Hangzhou Global Scientific and Technological Innovation Center Hangzhou P. R. China
Hongzheng Chen